Business Acquisition, Contingent Payments, Fair Value

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Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Abstract]

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Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]

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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage

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Cash and Cash Equivalents, Restricted, Fair Value Disclosure

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Fair Value Measurements (Balances Measured at Fair Value) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities, current portion	$ 400	$ 400
Assets
Cash and cash equivalents	193,862	158,821	$ 145,341	$ 140,311
Restricted cash	16,488	19,030
Investment available for sale	16,800	17,400
Fair Value, Measurements, Nonrecurring [Member]
Assets
Outstanding principal		3,322,475
Fair Value, Measurements, Recurring
Liabilities
Contingent payments	3,038	3,632
Assets
Cash and cash equivalents	193,862	158,821
Restricted cash	16,488	19,030
Investment available for sale	17,259	17,839
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1 [Member]
Liabilities
Contingent payments	0	0
Assets
Cash and cash equivalents		158,821
Cash and cash equivalents	193,862
Restricted cash		19,030
Investment available for sale	0	0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 [Member]
Liabilities
Contingent payments	0	0
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Investment available for sale	0	0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3 [Member]
Liabilities
Contingent payments	3,038	3,632
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Investment available for sale	17,259	17,839
Parent Company [Member]
Assets
Cash and cash equivalents	1,212	2	$ 2	$ 0
Outstanding principal	$ 3,283,129	2,309,725
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument		3,366,251
Estimate of Fair Value Measurement [Member] \| Parent Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument		2,348,120
Senior Notes \| Senior Notes Due 2020 [Member] \| Parent Company [Member]
Assets
Outstanding principal		350,000
Senior Notes \| Senior Notes Due 2020 [Member] \| Estimate of Fair Value Measurement [Member] \| Parent Company [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument		$ 772,500
Earnout on Excess of EBITDA in 2015 \| Estimated Probability [Member] \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage	10.30%